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HSS Step Drill Bit, 3/16-7/8 In, Step 1/16

IRWIN UNIBIT

Price: $45.55 / each

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  • Item # 6A922
  • Mfr. Model # UNIBIT 4
  • NSN # 5133-01-372-2312
  • UNSPSC # 27112801
  • Catalog Page # 960
  • Shipping Weight 0.2 lbs.
Country of Origin USACountry of Origin is subject to change.

Technical Specs

  • ItemStep Drill Bit
  • Shank Size3/8"
  • Number of Hole Sizes12
  • Size3/16 to 7/8"
  • Step Thickness1/16"
  • MaterialHigh Speed Steel
  • DesignEnsures True Starts Without Walking Even on Curved Surfaces
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Rated 4.5 out of 5 by 2reviewers.
Rated 5 out of 5 by THE.BEST - A must for stainless The Unibit is an incredible tool. I'm a sculptor and interactive museum designer/fabricator, and often need to drill larger holes through stabiles steel pile and sheet. This can easily destroy even the titanium bits, also brand new twist bits as the stainless work hardens. These cobalt Unibits effortlessly plow through the metal one step size at a time in seconds with beautiful results, even with a hand drill. One bit drills hole after hole. I could not recommend more highly. August 31, 2014
Rated 4 out of 5 by These are great bits for making larger holes in mild steel and plastic. If you're making large holes in stainless steel, I suggest you get the cobalt version of it, though. I ruined one making a hole in a piece of stainless plate, even with plenty of lubrication while drilling it. May 6, 2014
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Product Q&A

(1 Question : 1 Answer)

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If not, What type of bit does go into glass?
Field of Industry:: Teacher
Product used for:: Drilling into glass block
Years purchasing from Grainger:: 20
2 years, 4 months ago
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Answers

Answer: 
No. Step drill bits like this one are designed for drilling in fairly thin metal. (Thinner than the step depth.)

For a glass block, you are going to want to use a drill bit that is specified as a glass / ceramic drill bit, such as 3AEE2.

One thing I can tell you from experience, you will want the glass you are drilling to be under water if at all possible. That way you will keep the drill bit cool and lubricated (both are very important), and if you accidentally shatter the glass you are drilling, then the shards won't fly everywhere.

Also, take your time.

Glass and ceramic drill bits use an abrasive to rub their way through the work, as opposed to cutting, like traditional drill bits do, so they are more susceptible to heat build up.
Age: 25 to 34
2 years, 4 months ago
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